In large bowl, mix butter, Parmesan cheese, salt, pepper and egg.,Cook spaghetti and drain and put spaghetti with preceding mix and toss to coat well.,Spread evenly in 13 x 9-inch pan. Brown meat in large pan, adding onion, pepper and garlic.,Drain off fat.,Stir in sauce, sugar and oregano.,Spread cottage cheese over spaghetti layer.,Top with meat mixture.,Bake at 350° for 30 minutes.,Sprinkle Mozzarella cheese and bake another ten minutes. Let stand 15 minutes before serving.,______